xcode 升级到 XCode10.3 项目报错

错误描述：

Description: Failed to find a suitable device for the type IBSimDeviceTypeiPad2x (com.apple.dt.Xcode.IBSimDeviceType.iPad-2x) with runtime iOS 12.4 (12.4 - 16G73) - com.apple.CoreSimulator.SimRuntime.iOS-12-4

        Failure Reason: Failed to create new simulator device that matches IBSimDeviceTypeiPad2x (com.apple.dt.Xcode.IBSimDeviceType.iPad-2x) for runtime iOS 12.4 (12.4 - 16G73) - com.apple.CoreSimulator.SimRuntime.iOS-12-4 (Invalid runtime: com.apple.CoreSimulator.SimRuntime.iOS-12-4)

        Underlying Errors:

        Description: Invalid runtime: com.apple.CoreSimulator.SimRuntime.iOS-12-4

解决：

①杀死所有的simulator进程

$ sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

②设置正确的xcode路径

$ sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

③如果以上两步未起作用则重置所有simulator

$ xcrun simctl erase all